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# Northern Prairie Star Party Black Nugget Lake September 15, 2012 - PowerPoint PPT Presentation

Northern Prairie Star Party Black Nugget Lake September 15, 2012 . Brian Martin The King’s University College. Three Fundamental “Sciences”. Measuring “Distance”, Position & “Scale”  Astrometry Measuring Brightness and Intensity  Photometry Measuring “Colour”  Spectroscopy.

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Black Nugget Lake

September 15, 2012

Brian Martin

The King’s University College

• Measuring “Distance”, Position & “Scale”  Astrometry

• Measuring Brightness and Intensity  Photometry

• Measuring “Colour”  Spectroscopy

Exciting science that you can do from the back yard!

August 29, 2012

H-alpha filter

0.001 s exposure

ED80

Atik 314L+ camera

TKUCO

How big are the lunar features in this image?

S

R

q

• The Small Angle Formula Rq* = S where:

• R = distance from object

• q = angle that the object subtends in the sky

• S = distance across the object

• Scale in (seconds of arc)/mm found by:

• In the previous image a ED80 telescope was used so the scale is (206265)/(600 mm) = 343.8 “/mm

• The Atik 314L+ has 6.45 mm pixels, so each pixel has a scale of 342.8”/mm × 0.00645mm/px = 2.22 “/px when used with the ED80

• By measuring the number of pixels you can measure the angle that an object or feature subtends

850 px = 3457 km

(0.5% error)

• Capuanus Crater:

• December 26,2009

• C14, f/11

• Imaging source DMK2104

• 2000 frames

• Scale = 0.20”/px

• Distance = 0.002523 AU

• Apennines (Eratsothenes, Archimedes)

• March 1, 2012

• C14, f/7

• Atik 314L+

• 20 frames (0.005 s)

• Scale = 0.52”/px

• Distance = 0.00262 AU

• Jupiter

• November 5, 2011

• C14, f/11

• Imaging Source DMK2104

• LRGB (~2000 frames each)

• Scale = 0.26”/px

• M57

• August 26, 2011

• C14 f/7

• ST7E

• LRGB

• Scale 1.49”/px

• Distance = 2300 ly

• M15

• August 21, 2011

• C14 f/7

• ST7E

• LRGB

• Scale 1.49”/px

• Distance = 33 Kly

• Intrinsic Variables

• dScuti

• SX Phe

• Novae and Supernovae

• Cataclysmic Variables

Modest cost (< \$2000)

Excellent software support

Monochrome with no anti-blooming is preferred

Pixel size should be carefully matched to image scale – need to oversample

Capable of milli-magnitude precision photometry

Atik 314L+

SBIG ST7E

SX Phoenicis Variables

• BL Camelopardalis

• Average mag 13.1

• Period

• 0.0389d

• 56 minutes – this is an exciting system to watch!!

40 s integration, C14 f/7

ST7E camera – KAF400 detector

November 9, 2009

BL Cam

Teff 7730 K

Age ~4Ga

Metal poor

Period shows a

Small change over time!

November 9, 2009, s (C2-C1) = 0.007 mag